CN102802317A - Adjusting device of LED (Light-Emitting Diode) light source - Google Patents
Adjusting device of LED (Light-Emitting Diode) light source Download PDFInfo
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- CN102802317A CN102802317A CN2012103092190A CN201210309219A CN102802317A CN 102802317 A CN102802317 A CN 102802317A CN 2012103092190 A CN2012103092190 A CN 2012103092190A CN 201210309219 A CN201210309219 A CN 201210309219A CN 102802317 A CN102802317 A CN 102802317A
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Abstract
The invention provides an adjusting device of an LED (Light-Emitting Diode) light source. The adjusting device comprises a detector, a converter and a driver, wherein the driver is used for detecting the Nth on time of a power switch of the LED light source and/or the Nth off time of the power switch of the LED light source, comparing the Nth on time with a preset on time to generate an on logic level signal, and comparing the Nth off time with a preset off time to generate an off logic level signal; the converter is used for converting the on logic level signal and/or the off logic level signal into a reverence voltage signal; the driver is used for adjusting the brightness of the LED light source according to the reference voltage signal after the power switch of the LED light source is on for the (N+1)th time; and N is a positive integer. According to the invention, on the basis of not increasing peripheral circuits and extra cost, the LED light source can be adjusted conveniently, simply and rapidly.
Description
Technical field
The present invention relates to a kind of adjusting device, relate in particular to a kind of adjusting device of led light source.
Background technology
There are shortcomings such as luminous efficiency is low, power consumption is big, useful life is short in the traditional lighting technology, and LED illumination has advantages such as long, energy-conservation, safety of life-span, environmental protection, alternative rapidly traditional lighting.Traditional light modulation is through the unlatching of mains switch and the switching of turn-offing the realization light-source brightness; Every unlatching and turn-off switch No. one time, light source can only be selected a kind of state, so not only makes the light modulation process become complicated; And, influence the life-span of light source because of too much unlatching and turn-off number of times.
Summary of the invention
Main purpose of the present invention is to provide a kind of adjusting device of led light source, on the basis that does not increase peripheral circuit and extra cost, realizes the convenience of led light source, simply and fast regulates.
In order to achieve the above object, the invention provides a kind of adjusting device of led light source, comprising:
Detector; Be used to detect the N time turn-off time of mains switch of the N time service time and/or led light source of the mains switch of led light source; And this N time service time compared with predefined service time produce the enabling logic level signal, with this N time turn-off time generation shutoff logic level signal of comparing with the predefined turn-off time;
Transducer is used for converting this enabling logic level signal and/or this shutoff logic level signal into reference voltage signal;
Driver is used for after the mains switch of led light source is opened for the N+1 time, regulating the brightness of led light source according to this reference voltage signal;
N is a positive integer.
During enforcement, said detector comprises service time counter, turn-off time counter, powering on enables unit and latch, wherein,
Said service time counter, be used to detect the N time service time of the mains switch of led light source, and this N time service time and predefined service time compared output enabling logic level signal;
Said turn-off time counter is used to detect the N time turn-off time of the mains switch of led light source, and this N time turn-off time and predefined turn-off time are compared, and logic level signal is turn-offed in output;
Said powering on enables the unit; Be used to detect the voltage of controller power source, and when the voltage of this controller power source is higher than first voltage of setting, be output as the enable signal of logic high; When the voltage of this controller power source is lower than predefined second voltage, be output as the enable signal of logic low; This controller power source is the power supply for the adjusting device power supply of led light source;
Said latch is used for when this enable signal is logic high, and the enabling logic level signal of said service time counter output and/or the shutoff logic level signal of said turn-off time counter output are latched.
During enforcement, said transducer comprises decoder and MUX, wherein,
Said decoder is used for this enabling logic level signal and/or this shutoff logic level signal are deciphered;
Said MUX is used for selecting corresponding output reference voltage signal according to the control signal that obtains after deciphering.
During enforcement, said transducer comprises decoder and frequency divider, wherein,
Said decoder is used for this enabling logic level signal and/or this shutoff logic level signal are deciphered;
Said frequency divider, the control signal that obtains after being used to decipher is carried out M times of frequency division to a clock signal, and M is a positive integer.
During enforcement, said driver comprises reference voltage source and current controller, wherein,
Said reference voltage source is exported first reference voltage signal, second reference voltage signal, the 3rd reference voltage signal and the 4th reference voltage signal;
Said current controller is used for the reference voltage signal of current detection signal that flows through led light source and the output of said MUX is compared, and generates a control signal, is used to control the outside switching tube of adjusting device of led light source.
During enforcement, said driver comprises reference voltage source, current controller and logical AND gate;
Said reference voltage source is used for the output reference voltage signal;
Said current controller is used for the current detection signal that flows through led light source and this reference voltage signal are compared the output pulse width control signal;
Said logical AND gate is used for output signal and said pulse duration control signal according to said frequency divider, generates a control signal, is used to control the outside switching tube of adjusting device of led light source.
During enforcement, said driver comprises reference voltage source, oscillator and current controller;
Said current controller comprises first NAND gate, second NAND gate, comparator and error amplifier;
Said reference voltage source is exported first reference voltage signal, second reference voltage signal, the 3rd reference voltage signal and the 4th reference voltage signal;
Said oscillator is used to export first clock signal, triangular signal and second clock signal;
Said second clock signal is as input clock signal and the input clock signal of said turn-off time counter of said switching time of counter;
Said error amplifier is used for the reference voltage signal of current detection signal that flows through led light source and the output of said MUX is carried out error amplification, output error amplifying signal;
Said comparator is used for said triangular signal and said error amplification signal being compared the output pulse width conditioning signal;
The first input end of said second NAND gate inserts said pulse width modulation signal, and second input of said second NAND gate is connected with the output of said first NAND gate; The control signal of said second NAND gate output inserts the grid of external switch pipe, inserts the first input end of said first NAND gate simultaneously;
Second input of said first NAND gate inserts first clock signal of said oscillator output;
Said first NAND gate and said second NAND gate constitute rest-set flip-flop.
Compared with prior art; (N is a positive integer to the N of the adjusting device of led light source of the present invention through the mains switch of detector detecting led light source; Represent 1; 2,3......) the N time turn-off time of the mains switch of inferior service time and/or led light source, and this N time service time compared with predefined service time produce the enabling logic level signal; This N time turn-off time compared with the predefined turn-off time to produce turn-off logic level signal; The brightness of the N+1 time unlatching back of mains switch led light source of led light source is controlled according to this enabling logic level signal and/or this shutoff logic level signal through transducer and driver, can on the basis that does not increase peripheral circuit and extra cost, be realized the convenience of led light source, simply and fast regulate.
Description of drawings
Fig. 1 is the structured flowchart of first embodiment of the adjusting device of led light source of the present invention;
Fig. 2 is the structured flowchart of the detector that comprises of the adjusting device of led light source of the present invention;
Fig. 3 is the structured flowchart of first embodiment of the transducer that comprises of the adjusting device of led light source of the present invention;
Fig. 4 is the structured flowchart of second embodiment of the transducer that comprises of the adjusting device of led light source of the present invention;
Fig. 5 is the structured flowchart of first embodiment of the driver that comprises of the adjusting device of led light source of the present invention;
Fig. 6 is the structured flowchart of second embodiment of the driver that comprises of the adjusting device of led light source of the present invention;
Fig. 7 is N62, the N50 among second embodiment of said driver, the sequential chart of N53;
Fig. 8 is the circuit diagram that the adjusting device of led light source of the present invention is applied to;
Fig. 9 is the structured flowchart of second embodiment of the adjusting device of led light source of the present invention;
Figure 10 is N33, N31, the N32 of the detector that comprises of second embodiment of the adjusting device of led light source of the present invention, the sequential chart of N75.
Embodiment
For making the object of the invention, technical scheme and advantage express clearlyer, the present invention is done further detailed explanation again below in conjunction with accompanying drawing and specific embodiment.
The mode of practical implementation of the present invention is not limited only to following description, combines accompanying drawing further explanation in addition at present.
As shown in Figure 1, first embodiment of the adjusting device of led light source of the present invention comprises detector 201, transducer 202 and driver 203;
The input signal of said detector 201 is through the power supply input signal behind the mains switch, and the output signal of said detector 201 is output signal N34 and output signal N35;
The input signal of said transducer 202 is output signal N34 and output signal N35, said transducer 202 output reference voltage signal N44 of said detector 201;
The input signal of said driver 203 is the reference voltage signal N44 of transducer 202 outputs and the power supply input signal after the process Switching Power Supply;
Said detector 201; Be used to detect the N time turn-off time of mains switch of the N time service time and/or led light source of the mains switch of led light source; And this N time service time and predefined standard service time relatively produced the enabling logic level signal, this N time turn-off time compared with the predefined standard turn-off time to produce turn-off logic level signal;
Said transducer 202 is used for converting this enabling logic level signal and/or this shutoff logic level signal into reference voltage signal;
Said driver 203 is used for after the mains switch of led light source is opened for the N+1 time, regulating the brightness of led light source according to this reference voltage signal;
N is a positive integer.
(N is a positive integer to the N of first embodiment of the adjusting device of led light source of the present invention through the mains switch of detector 201 detecting led light sources; Represent 1; 2; 3......) the N time turn-off time of the mains switch of inferior service time and/or led light source; And this N time service time and predefined standard service time T0 relatively produced the enabling logic level signal, and this N time turn-off time and predefined standard turn-off time T compared and produce the shutoff logic level signal, control through the brightness that transducer and driver are opened the back led light source according to this enabling logic level signal and/or this shutoff logic level signal for the N+1 time to the mains switch of led light source; Shown in table; Represent the N time service time of the mains switch of led light source with Ton, represent the N time turn-off time of the mains switch of led light source with Toff, T0, T are respectively predefined standard service time, predefined standard turn-off time; In theory; The N time turn-off time Toff of the N time service time Ton of the mains switch through selecting led light source and the mains switch of led light source, after the N+1 time unlatching of mains switch of led light source, can be according to four kinds of brightness of state 1 ~ state 4 selection led light sources;
Table one
| The service time of the mains switch of led light source | The turn-off time of the mains switch of led light source | State |
| Ton>;T0 | Toff＞T | State 1 |
| Ton<T0 | Toff＞T | State 2 |
| Ton>;T0 | Toff＜T | State 3 |
| Ton<T0 | ?Toff＜T | State 4 |
First embodiment of the adjusting device of led light source of the present invention can realize the convenience of led light source, simply and fast regulate on the basis that does not increase peripheral circuit and extra cost.
During enforcement, the adjusting device of led light source of the present invention can be realized by a controller.
As shown in Figure 2, said detector 201 comprises service time counter 301, turn-off time counter 302, powering on enables unit 303 and latch 304;
Said service time, counter 301 input signal was to power on to enable the enable signal N33 of unit 303 outputs, and the enabling logic level signal N31 of said service time counter 301 outputs is as the input signal of latch 304;
The input signal of said turn-off time counter 302 is to power on to enable the enable signal N33 of unit 303 outputs, and the shutoff logic level signal N32 of said turn-off time counter 302 outputs is as the input signal of latch 304;
The said input signal that enables unit 303 of powering on is through the power supply input signal after the Switching Power Supply, and said powering on enables the enable signal N33 of unit 303 outputs as the input signal of latch 304, service time counter 301 input signal and the input signal of turn-off time counter 302;
Said service time counter 301, be used to detect the N time service time Ton of the mains switch of led light source, and should service time Ton and a predefined standard service time T0 compare, produce an enabling logic level signal N31; This enabling logic level signal N31 can be logic high signal or logic low signal;
The service time Ton of the N secondary source switch of described led light source confirms that the time of opening for the N time with the mains switch of led light source is the starting point of timing, and the time of closing for the N time with the mains switch of led light source is the terminal point of timing;
Said turn-off time counter 302; Be used to detect the N time turn-off time Toff of the mains switch of led light source; And the N time turn-off time Toff and predefined standard turn-off time T of the mains switch of this led light source compared, produce one and turn-off logic level signal N32; This shutoff logic level signal N32 can be logic high signal or logic low signal;
The N time turn-off time of the mains switch of described led light source confirm that the time of turn-offing for the N time with the mains switch of led light source is the starting point of timing, with time of the N+1 time unlatching of mains switch of led light source be the terminal point of timing;
Said powering on enables unit 303, is used for importing through the power supply behind the mains switch through detecting, sends enable signal N33;
Said latch 304; Be used for enabling the enable signal N33 that sends unit 303 when effective when powering on; The enabling logic level signal N31 of service time counter 301 outputs and/or the shutoff logic level signal N32 of turn-off time counter 302 outputs are latched; The output signal N34 of latch 304 is latch result of the letter enabling logic level signal N31 of service time counter 301 outputs, and the output signal N35 of latch 304 is latch result of the shutoff logic level signal N32 of turn-off time counter 302 outputs.
According to a kind of embodiment, said transducer comprises decoder and MUX, wherein,
Said decoder is used for this enabling logic level signal and/or this shutoff logic level signal are deciphered;
Said MUX is used for selecting corresponding output reference voltage signal according to the control signal that obtains after deciphering.
Preferably, as shown in Figure 3, first embodiment of said transducer 202 comprises decoder 310 and MUX 311; The input signal of said decoder 310 is output signal N34 and N35 of detector 201; 310 couples of N34 of said decoder and N35 decipher, and export the first control signal N40, the second control signal N41, the 3rd control signal N42 and the 4th control signal N43;
The input signal of said MUX 311 is the first reference voltage signal N45, the second reference voltage signal N46, the 3rd reference voltage signal N47 and the 4th reference voltage signal N48, and the first control signal N40, the second control signal N41, the 3rd control signal N42 and the 4th control signal N43 of decoder 310 outputs; The reference voltage signal N44 of said MUX 311 outputs is the first reference voltage signal N45, the second reference voltage signal N46, the 3rd reference voltage signal N47 or the 4th reference voltage signal N48;
Said MUX 311; Be used for through the said first control signal N40, the said second control signal N41, said the 3rd control signal N42 and said the 4th control signal N43; A reference voltage signal among the first reference voltage signal N45, the second reference voltage signal N46, the 3rd reference voltage signal N47 and the 4th reference voltage signal N48 of input is strobed into output; Generate reference voltage signal N44, said reference voltage signal N44 promptly is the signal of transducer 202 outputs;
The reference voltage signal N44 of said transducer 202 outputs is analog signals.
Said transducer 202 is given an example like table two according to the output signal N34 of detector 201 and the rule of N35 selection reference voltage signal;
Table two:
| N34 state in the |
N35 state in the |
N44 state in the transducer |
| Logic high | Logic high | Identical with the N45 signal |
| Logic high | Logic low | Identical with the N46 signal |
| Logic low | Logic high | Identical with the N47 signal |
| Logic low | Logic low | Identical with the N48 signal |
According to a kind of embodiment, said transducer comprises decoder and frequency divider, wherein,
Said decoder is used for this enabling logic level signal and/or this shutoff logic level signal are deciphered;
Said frequency divider is used for according to the control signal that obtains after the decoding one clock signal being carried out M times of frequency division, M positive integer.
As shown in Figure 4, second embodiment of said transducer 202 comprises decoder 310 and frequency divider 312;
The input signal of said frequency divider 312 is the first control signal N40, the second control signal N41, the 3rd control signal N42 and the 3rd control signal N43 of a clock signal N49 and 310 outputs of said decoder; The output signal N50 of said frequency divider 312 is clock signals; The output signal N50 of said frequency divider 312 is that (N is a positive integer for the Fractional-N frequency of clock signal N49; For example be 1,2,3 ...);
The output signal N50 of said transducer 202 is digital signals.
The rule that said transducer 202 carries out N times of frequency division to clock signal according to the output signal N34 of detector 201 and N35 is for example like table three;
Table three
| N34 state in the |
N35 state in the |
N50 signal condition in the controller |
| Logic high | Logic high | 2 frequency divisions of N49 signal in the controller |
| Logic high | Logic low | 4 frequency divisions of N49 signal in the controller |
| Logic low | Logic high | 8 frequency divisions of N49 signal in the controller |
| Logic low | Logic low | 16 frequency divisions of N49 signal in the controller |
As shown in Figure 5, first embodiment of said driver 203 comprises reference voltage source 320, oscillator 321 and current controller 322;
The said reference voltage source 320 outputs first reference voltage signal N45, the second reference voltage signal N46, the 3rd reference voltage signal N47 and the 4th reference voltage signal N48, the said first reference voltage signal N45, the second reference voltage signal N46, the 3rd reference voltage signal N47 and the 4th reference voltage signal N48 are as the input signal of first embodiment of said transducer 202;
Said oscillator 321 produces a clock signal N49, and said clock signal N49 is as the input signal of second embodiment of said transducer 202;
The input signal of said current controller 322 is reference voltage signal N44 and the current detection signal N60 that flows through led light source of first embodiment output of said transducer 202;
The effect of said current controller 322 is that current detection signal N60 that flows through led light source and reference voltage signal N44 are compared, and exports a control signal N61, is used to control the outside power switch pipe of adjusting device of led light source of the present invention.
As shown in Figure 6, second embodiment of said driver 203 comprises reference voltage source 320, oscillator 321, current controller 322 and logical AND gate 323;
Said reference voltage source 320 output reference voltage signal N45A, said reference voltage signal N45A is as the input signal of current controller 322;
Said oscillator 321 produces a clock signal N49, and said clock signal N49 is as the input signal of second embodiment of said transducer 202;
The input signal of said current controller 322 is reference voltage signal N45A and the current detection signal N60 that flows through led light source of reference voltage source 320 outputs, and the output signal of said current controller 322 is pulse duration control signal N62;
The effect of said current controller 322 is that current detection signal N60 that flows through led light source and reference voltage signal N45A are compared, and exports a pulse duration control signal N62;
The input signal of said logical AND gate 323 is N62 and N50, and the output signal N63 of said logical AND gate 323 is used to control an outside power switch pipe of adjusting device of led light source of the present invention.
Fig. 7 is N62, the N50 among second embodiment of said driver 203, the sequential chart of N53.
Fig. 8 is the circuit diagram that the adjusting device of led light source of the present invention is used.
As shown in Figure 8, the circuit that the adjusting device of led light source of the present invention is applied to comprises mains switch 81, bridge rectifier 82, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, first resistance R 1, second resistance R 2, the first diode D1, the second diode D2, transformer 83, switch transistor T and led light source 84.
Fig. 9 is the circuit diagram of second embodiment of the adjusting device of led light source of the present invention.Second embodiment of the adjusting device of led light source of the present invention is based on first embodiment of the adjusting device of led light source of the present invention.
As shown in Figure 9, second embodiment of the adjusting device of led light source of the present invention comprises detector 201, transducer 202 and driver 203, wherein,
Said detector 201 comprises service time counter 301, turn-off time counter 302, powering on enables unit 303 and latch 304;
Said service time, counter 301 input signal was to power on to enable the enable signal N33 of unit 303 outputs, and said service time counter output signal N31 of 301 is as the input signal of latch 304;
The input signal of said turn-off time counter 302 is to power on to enable the enable signal N33 of unit 303 outputs, and the output signal N32 of said turn-off time counter 302 is as the input signal of latch 304;
Saidly power on that to enable 303 input be the power supply of controller, said powering on enables the enable signal N33 of unit 303 outputs as the input signal of latch 304, service time counter 301 input signal and the input signal of turn-off time counter 302;
The effect of said turn-off time counter 302 is that the detecting enable signal N33 that enables unit 303 output that powers on is the time of logic low; This time is the turn-off time; Represent with Toff; Shown in figure 10, when this turn-off time Toff surpassed predefined standard turn-off time T, the output signal N32 of turn-off time counter 302 will become logic high from logic low;
As shown in Figure 9; The said effect that enables unit 303 that powers on is: send enable signal N33 through detecting controller power source; When the voltage of controller power source is higher than the predefined first voltage V0; The enable signal N33 that enables unit 303 output that powers on is a logic high, and when the voltage of controller power source was lower than the predefined second voltage V1, powering on enabled 303 to send enable signal N33 be logic low;
Said controller power source refers to the power supply into the adjusting device power supply of led light source;
The effect of said latch 304 is; When powering on the enable signal N33 arrival rising edge that enables unit 303 outputs; Service time counter 301 the output signal N31 and the output signal N32 of turn-off time counter 302 are latched; The output signal N34 of latch 304 is service time counter output N31 signal latch results of 301, and the output signal N35 of latch 304 is output N32 signal latch results of turn-off time counter 302;
The input signal of said detector 201 is through the power supply input signal behind the mains switch, and the output signal of said detector 201 is output signal N34 and output signal N35;
The input signal of said transducer 202 is output signal N34 and output N35, said transducer output reference voltage signal N44 of said detector 201;
Said reference voltage signal N44 is an analog voltage signal;
Said transducer 202 comprises decoder 310 and MUX 311;
The input signal of said decoder 310 is output signal N34 and output signal N35 of detector 201; The control signal of said decoder 310 outputs is decode results N40, N41, N42 and the N43 of N34 and N35;
The input signal of said MUX 311 is control signal N40, N41, N42, N43 of output signal N45, N46, N47, N48 and decoder 310 outputs of driver 203; Said MUX 311 output reference voltage signal N44; Be a reference voltage signal, identical with a reference voltage signal among N45 ~ N48;
The effect of said MUX 311 is; Through said control signal N40, N41, N42 and N43; A reference voltage signal among reference voltage signal N45, N46, N47 and the N48 of input is strobed into output, and the reference voltage signal N44 of said MUX 311 outputs promptly is the output signal of transducer 202;
The reference voltage signal N44 of said transducer 202 outputs is analog signals;
Said driver 203 comprises reference voltage source 320, oscillator 321 and current controller 322;
Said current controller 322 comprises first NAND gate 500, second NAND gate 501, comparator 502 and error amplifier 503;
The input signal of said driver 203 is reference voltage signal N44 and the current detection signal N60 that flows through led light source of transducer 202 outputs; The output signal of said driver 203 is N45, N46, N47, N48 that reference voltage source 320 produces, clock signal N75 that the error amplification signal N70 that error amplifier 503 produces, oscillator 321 produce and the control signal N63 that drives the external switch pipe;
Said reference voltage source 320 output reference voltage signal N45, N46, N47 and N48, said reference voltage signal N45, N46, N47 and N48 are as the input signal of transducer 202;
Said oscillator 321 clock signal N72 and clock signal N75;
The input signal of said current controller 322 is clock signal N72 and triangular signal N73 that the reference voltage signal N44 of transducer 202 outputs, the current detection signal N60 that flows through led light source and oscillator 321 produce;
The effect of said current controller 322 is that current detection signal N60 that flows through led light source and reference voltage signal N44 are compared, and exports a control signal N63, is used to control the outside switch transistor T of adjusting device of led light source;
The clock signal N75 of said oscillator 321 outputs is as the input clock signal of switching time counter 301 and turn-off time counter 302, and said 321 while of oscillator clock signal N72 and triangular signal N73 are as the input signal of current controller 322;
An input signal of said error amplifier 503 is reference voltage signal N44 of said transducer 202 outputs; The another one input signal of said error amplifier 503 is the current detection signal N60 that flow through led light source, said error amplifier 503 output error amplifying signal N70;
An input signal of said comparator 502 is triangular signal N73 of said oscillator 321 outputs; The another one input of said comparator 502 connects the error amplification signal N70 of error amplifier 503 outputs, said comparator 502 output pulse width conditioning signal N71;
The first input end of said second NAND gate 501 inserts the pulse width modulation signal N71 of said comparator 502 outputs, and second input of said second NAND gate 501 is connected with the output of said first NAND gate 500; The control signal N63 of said second NAND gate 501 outputs inserts the grid of external switch pipe, inserts the first input end of said first NAND gate 500 simultaneously;
Second input of said first NAND gate 500 inserts the clock signal N72 of said oscillator 321 outputs; The first input end of said first NAND gate 500 inserts the control signal N63 of said second NAND gate 501 outputs, and the output of said first NAND gate 500 is connected with second input of said second NAND gate 501;
Said error amplifier 503 is used for reference voltage signal N44 and current detection signal N60 are carried out error amplification, output error amplifying signal N70;
The output of said error amplifier 503 is through outside the 4th capacitor C 4 ground connection, and this capacitor C is as the building-out capacitor of the adjusting device of whole LED light source;
Said first NAND gate 500 constitutes a rest-set flip-flop with said second NAND gate 501.
The present invention is applicable to the driving power of all led light sources that have mains switch.
In sum, owing to adopted technique scheme, the invention has the beneficial effects as follows:
1, the mains switch through closing and open led light source once when led light source is opened next time, has nearly four kinds of states to select;
2, when carrying out the led light source status adjustment, reduce the mains switch number of times of led light source, increase the life-span of led light source;
3, need not increase extra peripheral components, reduce cost, help popularizing of led light source;
More than explanation is just illustrative for the purpose of the present invention; And nonrestrictive, those of ordinary skills understand, under the situation of spirit that does not break away from accompanying claims and limited and scope; Can make many modifications, variation or equivalence, but all will fall in protection scope of the present invention.
Claims (7)
1. the adjusting device of a led light source is characterized in that, comprising:
Detector; Be used to detect the N time turn-off time of mains switch of the N time service time and/or led light source of the mains switch of led light source; And this N time service time compared with predefined service time produce the enabling logic level signal, with this N time turn-off time generation shutoff logic level signal of comparing with the predefined turn-off time;
Transducer is used for converting this enabling logic level signal and/or this shutoff logic level signal into reference voltage signal;
Driver is used for after the mains switch of led light source is opened for the N+1 time, regulating the brightness of led light source according to this reference voltage signal;
N is a positive integer.
2. the adjusting device of led light source as claimed in claim 1 is characterized in that,
Said detector comprises service time counter, turn-off time counter, powering on enables unit and latch, wherein,
Said service time counter, be used to detect the N time service time of the mains switch of led light source, and this N time service time and predefined service time compared output enabling logic level signal;
Said turn-off time counter is used to detect the N time turn-off time of the mains switch of led light source, and this N time turn-off time and predefined turn-off time are compared, and logic level signal is turn-offed in output;
Said powering on enables the unit; Be used to detect the voltage of controller power source, and when the voltage of this controller power source is higher than first voltage of setting, be output as the enable signal of logic high; When the voltage of this controller power source is lower than predefined second voltage, be output as the enable signal of logic low; This controller power source is the power supply for the adjusting device power supply of led light source;
Said latch is used for when this enable signal is logic high, and the enabling logic level signal of said service time counter output and/or the shutoff logic level signal of said turn-off time counter output are latched.
3. the adjusting device of led light source as claimed in claim 1 is characterized in that,
Said transducer comprises decoder and MUX, wherein,
Said decoder is used for this enabling logic level signal and/or this shutoff logic level signal are deciphered;
Said MUX is used for selecting corresponding output reference voltage signal according to the control signal that obtains after deciphering.
4. the adjusting device of led light source as claimed in claim 1 is characterized in that,
Said transducer comprises decoder and frequency divider, wherein,
Said decoder is used for this enabling logic level signal and/or this shutoff logic level signal are deciphered;
Said frequency divider is used for according to the control signal that obtains after the decoding one clock signal being carried out M times of frequency division, and M is a positive integer.
5. the adjusting device of led light source as claimed in claim 3 is characterized in that,
Said driver comprises reference voltage source and current controller, wherein,
Said reference voltage source is exported first reference voltage signal, second reference voltage signal, the 3rd reference voltage signal and the 4th reference voltage signal;
Said current controller is used for the reference voltage signal of current detection signal that flows through led light source and the output of said MUX is compared, and generates a control signal, is used to control the outside switching tube of adjusting device of led light source.
6. the adjusting device of led light source as claimed in claim 4 is characterized in that, said driver comprises reference voltage source, current controller and logical AND gate;
Said reference voltage source is used for the output reference voltage signal;
Said current controller is used for the current detection signal that flows through led light source and this reference voltage signal are compared the output pulse width control signal;
Said logical AND gate is used for output signal and said pulse duration control signal according to said frequency divider, generates a control signal, is used to control the outside switching tube of adjusting device of led light source.
7. the adjusting device of led light source as claimed in claim 3 is characterized in that,
Said driver comprises reference voltage source, oscillator and current controller;
Said current controller comprises first NAND gate, second NAND gate, comparator and error amplifier;
Said reference voltage source is exported first reference voltage signal, second reference voltage signal, the 3rd reference voltage signal and the 4th reference voltage signal;
Said oscillator is used to export first clock signal, triangular signal and second clock signal;
Said second clock signal is as input clock signal and the input clock signal of said turn-off time counter of said switching time of counter;
Said error amplifier is used for the reference voltage signal of current detection signal that flows through led light source and the output of said MUX is carried out error amplification, output error amplifying signal;
Said comparator is used for said triangular signal and said error amplification signal being compared the output pulse width conditioning signal;
The first input end of said second NAND gate inserts said pulse width modulation signal, and second input of said second NAND gate is connected with the output of said first NAND gate; The control signal of said second NAND gate output inserts the grid of external switch pipe, inserts the first input end of said first NAND gate simultaneously;
Second input of said first NAND gate inserts first clock signal of said oscillator output;
Said first NAND gate and said second NAND gate constitute rest-set flip-flop.
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Address after: 611731, room 1, building 3, No. 401, West Avenue, Chengdu hi tech Zone (West District, Sichuan) Patentee after: Chengdu Qi Chen electronic Limited by Share Ltd Address before: 611731 innovation center, No. 4, West core road, hi tech West District, Sichuan, Chengdu C341-343 Patentee before: Chengdu Chip-Rail Microelectronic Co., Ltd. |